| Electrical & Electronic Engineering |
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| Mixed nonlinear dynamic voltage phasor tracing method based on WAMS/SCADA |
| Xiao-gang CHEN, Yong-hui YI, Wei WANG, Quan-yuan JIANG, Chuang-xin GUO, Yi-jia CAO |
| School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; Hangzhou Electric Power Bureau, Hangzhou 310009, China; Zhejiang Provincial Electric Power Company, Hangzhou 310007, China |
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Abstract By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit (PMU) malfunction in a power system. By modeling the load characteristic with data from SCADA, we employed the Gauss-Seidel method to solve the nonlinear equations and estimate the voltage of unobservable buses with the high precision voltages of neighboring buses measured by a PMU. Simulations were carried out on the IEEE 39-bus system, and the results show that this novel method can dynamically and accurately trace the variation of the voltage phasor of the unobservable buses.
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Received: 04 March 2008
Published: 02 May 2009
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